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* The MIT License (MIT)
*
* Copyright (c) 2019 Mark van Seventer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// @see https://sharp.pixelplumbing.com/en/stable/api-operation/#convolve
// Strict mode.
'use strict'
// Local modules.
const queue = require('../../lib/queue')
// Configure.
const options = {
height: {
desc: 'Height of the kernel',
type: 'number'
},
kernel: {
desc: 'Array of length width × height containing the kernel values',
defaultDescription: '"-1 0 1 -2 0 2 -1 0 1"',
type: 'string'
},
scale: {
desc: 'The scale of the kernel',
defaultDescription: 'sum',
nargs: 1,
type: 'number'
},
offset: {
desc: 'The offset of the kernel',
nargs: 1,
type: 'number'
},
width: {
desc: 'Width of the kernel',
type: 'number'
}
}
// Command builder.
const builder = (yargs) => {
const optionNames = Object.keys(options)
return yargs
.strict()
.example('$0 convolve 3 3 "-1 0 1 -2 0 2 -1 0 1"', 'The output will be the convolution of the input image with the horizontal Sobel operator')
.epilog('For more information on available options, please visit https://sharp.pixelplumbing.com/en/stable/api-operation/#convolve')
.options(options)
.global(optionNames, false)
.group(optionNames, 'Command Options')
}
// Command handler.
const handler = (args) => {
const kernel = args.kernel.split(' ').map((el) => parseInt(el, 10))
return queue.push([ 'convolve', (sharp) => {
return sharp.convolve({
width: args.width,
height: args.height,
kernel,
scale: args.scale,
offset: args.offset
})
}])
}
// Exports.
module.exports = {
command: 'convolve <width> <height> <kernel>',
describe: 'Convolve the image with the specified kernel',
builder,
handler
}
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